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The patch series introduces linearisable topology changes using raft protocol. The state machine driven by raft is described in "service: Introduce topology state machine". Some explanations about the implementation can be found in "storage_service: raft topology: implement topology management through raft". The code is not ready for production. There is not much in terms of error handling and integration with the rest of the system is not even started. For full integration request fencing will need to be implemented and token_metadata has to be extended to support not just "pending" nodes but concepts of "read replica set" and "write replica set". The code may be far from be usable, but it is hidden behind the "experimental raft" flag and having it in tree will relieve me from constant rebase burden. * 'raft-topology-v6' of github.com:scylladb/scylla-dev: storage_service: fix indentation from previous patch storage_service: raft topology: implement topology management through raft service: raft: make group0_guard move assignable service: raft: wire up apply() and snapshot transfer for topology in group0 state machine storage_service: raft topology: introduce a function that applies topology cmd to local state machine storage_service: raft topology: introduce a raft monitor and topology coordinator fibers storage_service: raft topology: introduce snapshot transfer code for the topology table raft topology: add RAFT_TOPOLOGY_CMD verb that will be used by topology coordinator to communicated with nodes bootstrapper: Add get_random_bootstrap_tokens function service: raft: add support for topology_change command into raft_group0_client service: raft: introduce topology_change group0 command system_keyspace: add a table to persist topology change state machine's state service: Introduce topology state machine data structures storage_proxy: not consult topology on local table write